Added zoom support to the PDF viewer

Also increased page rasterization resolution when running at lower screen resolutions

es-app/src/PDFViewer.cpp

@@ -29,7 +29,6 @@ PDFViewer::PDFViewer()
     , mHelpInfoPosition {HelpInfoPosition::TOP}
 {
     Window::getInstance()->setPDFViewer(this);
-    mTexture = TextureResource::get("");
 }
 
 bool PDFViewer::startPDFViewer(FileData* game)
@@ -74,6 +73,19 @@ bool PDFViewer::startPDFViewer(FileData* game)
     mPageCount = 0;
     mCurrentPage = 0;
     mScaleFactor = 1.0f;
+    mZoom = 1.0f;
+    mPanAmount = 0.0f;
+    mPanOffset = {0.0f, 0.0f, 0.0f};
+
+    // Increase the rasterization resolution when running at lower screen resolutions to make
+    // the texture look ok when zoomed in.
+    const float resolutionModifier {mRenderer->getScreenResolutionModifier()};
+    if (resolutionModifier < 1.0f)
+        mScaleFactor = 1.8f;
+    else if (resolutionModifier < 1.2f)
+        mScaleFactor = 1.3f;
+    else if (resolutionModifier < 1.4f)
+        mScaleFactor = 1.15f;
 
     if (!getDocumentInfo()) {
         LOG(LogError) << "PDFViewer: Couldn't load file \"" << mManualPath << "\"";
@@ -303,11 +315,13 @@ void PDFViewer::convertPage(int pageNum)
 {
     assert(pageNum <= static_cast<int>(mPages.size()));
 
+    if (mPages[pageNum].imageData.empty()) {
 #if defined(_WIN64)
         std::wstring command {
             Utils::String::stringToWideString(Utils::FileSystem::getEscapedPath(mESConvertPath))};
         command.append(L" -convert ")
-        .append(Utils::String::stringToWideString(Utils::FileSystem::getEscapedPath(mManualPath)))
+            .append(
+                Utils::String::stringToWideString(Utils::FileSystem::getEscapedPath(mManualPath)))
             .append(L" ")
             .append(std::to_wstring(pageNum))
             .append(L" ")
@@ -326,7 +340,6 @@ void PDFViewer::convertPage(int pageNum)
             .append(std::to_string(static_cast<int>(mPages[pageNum].height)));
 #endif
 
-    if (mPages[pageNum].imageData.empty()) {
 #if (DEBUG_PDF_CONVERSION)
         LOG(LogDebug) << "Converting page: " << mCurrentPage;
 #if defined(_WIN64)
@@ -436,6 +449,7 @@ void PDFViewer::convertPage(int pageNum)
     mPageImage.reset();
     mPageImage = std::make_unique<ImageComponent>(false, false);
     mPageImage->setFlipY(true);
+    mPageImage->setLinearInterpolation(true);
     mPageImage->setOrigin(0.5f, 0.5f);
     if (mHelpInfoPosition == HelpInfoPosition::TOP) {
         mPageImage->setPosition(mRenderer->getScreenWidth() / 2.0f,
@@ -451,16 +465,20 @@ void PDFViewer::convertPage(int pageNum)
     }
 
     float sizeReduction {0.0f};
-    if (mPages[pageNum].height > mRenderer->getScreenHeight() - mFrameHeight)
-        sizeReduction = mPages[pageNum].height - (mRenderer->getScreenHeight() - mFrameHeight);
+    if (mPages[pageNum].height / mScaleFactor > mRenderer->getScreenHeight() - mFrameHeight)
+        sizeReduction =
+            (mPages[pageNum].height / mScaleFactor) - (mRenderer->getScreenHeight() - mFrameHeight);
 
-    mPageImage->setMaxSize(glm::vec2 {mPages[pageNum].width / mScaleFactor,
-                                      (mPages[pageNum].height / mScaleFactor) - sizeReduction});
+    mPageImage->setMaxSize(
+        glm::vec2 {(mPages[pageNum].width / mScaleFactor) * mZoom,
+                   ((mPages[pageNum].height / mScaleFactor) * mZoom) - sizeReduction});
 
     mPageImage->setRawImage(reinterpret_cast<const unsigned char*>(&mPages[pageNum].imageData[0]),
                             static_cast<size_t>(mPages[pageNum].width),
                             static_cast<size_t>(mPages[pageNum].height));
 
+    mPanAmount = std::min(mRenderer->getScreenWidth(), mRenderer->getScreenHeight()) * 0.1f;
+
 #if (DEBUG_PDF_CONVERSION)
     LOG(LogDebug) << "ABGR32 data stream size: " << mPages[pageNum].imageData.size();
 #endif
@@ -475,9 +493,15 @@ void PDFViewer::render(const glm::mat4& /*parentTrans*/)
     mRenderer->drawRect(0.0f, 0.0f, Renderer::getScreenWidth(), Renderer::getScreenHeight(),
                         0x000000FF, 0x000000FF);
 
+    if (mZoom != 1.0f)
+        mPageImage->setPosition(mPageImage->getPosition() + (mPanOffset * mZoom));
+
     if (mPageImage != nullptr)
         mPageImage->render(trans);
 
+    if (mZoom != 1.0f)
+        mPageImage->setPosition(mPageImage->getPosition() - (mPanOffset * mZoom));
+
     if (mHelpInfoPosition != HelpInfoPosition::DISABLED) {
         // Render a dark gray frame behind the help info.
         mRenderer->setMatrix(mRenderer->getIdentity());
@@ -494,10 +518,18 @@ void PDFViewer::render(const glm::mat4& /*parentTrans*/)
 std::vector<HelpPrompt> PDFViewer::getHelpPrompts()
 {
     std::vector<HelpPrompt> prompts;
+    if (mZoom > 1.0f) {
+        prompts.push_back(HelpPrompt("up/down/left/right", "pan"));
+        prompts.push_back(HelpPrompt("ltrt", "reset"));
+    }
+    else {
         prompts.push_back(HelpPrompt("left/right", "browse"));
         prompts.push_back(HelpPrompt("down", "game media"));
         prompts.push_back(HelpPrompt("lt", "first"));
         prompts.push_back(HelpPrompt("rt", "last"));
+    }
+
+    prompts.push_back(HelpPrompt("lr", "zoom"));
 
     return prompts;
 }
@@ -524,22 +556,110 @@ void PDFViewer::showPreviousPage()
     convertPage(mCurrentPage);
 }
 
-void PDFViewer::showFirstPage()
+void PDFViewer::navigateUp()
 {
+    if (mZoom != 1.0f) {
+        if (mPanOffset.y * mZoom <= mPageImage->getSize().y / 2.0f)
+            mPanOffset.y += mPanAmount;
+    }
+}
+
+void PDFViewer::navigateDown()
+{
+    if (mZoom != 1.0f) {
+        if (mPanOffset.y * mZoom >= -(mPageImage->getSize().y / 2.0f))
+            mPanOffset.y -= mPanAmount;
+    }
+    else {
+        launchMediaViewer();
+    }
+}
+
+void PDFViewer::navigateLeft()
+{
+    if (mZoom != 1.0f) {
+        if (mPanOffset.x * mZoom <= mPageImage->getSize().x / 2.0f)
+            mPanOffset.x += mPanAmount;
+    }
+    else {
+        mPanOffset = {0.0f, 0.0f, 0.0f};
+        showPreviousPage();
+    }
+}
+
+void PDFViewer::navigateRight()
+{
+    if (mZoom != 1.0f) {
+        if (mPanOffset.x * mZoom > -(mPageImage->getSize().x / 2.0f))
+            mPanOffset.x -= mPanAmount;
+    }
+    else {
+        mPanOffset = {0.0f, 0.0f, 0.0f};
+        showNextPage();
+    }
+}
+
+void PDFViewer::navigateRightShoulder()
+{
+    if (mZoom <= 2.5f)
+        mZoom += 0.5f;
+
+    if (mZoom == 1.5f)
+        mHelp->setPrompts(getHelpPrompts());
+
+    convertPage(mCurrentPage);
+}
+
+void PDFViewer::navigateLeftShoulder()
+{
+    if (mZoom == 1.0f)
+        mPanOffset = {0.0f, 0.0f, 0.0f};
+
+    if (mZoom >= 1.5f)
+        mZoom -= 0.5f;
+
+    if (mZoom == 1.0f)
+        mHelp->setPrompts(getHelpPrompts());
+
+    convertPage(mCurrentPage);
+}
+
+void PDFViewer::navigateLeftTrigger()
+{
+    if (mZoom != 1.0f) {
+        mZoom = 1.0f;
+        mPanOffset = {0.0f, 0.0f, 0.0f};
+        mHelp->setPrompts(getHelpPrompts());
+        convertPage(mCurrentPage);
+        return;
+    }
+
     if (mCurrentPage == 1)
         return;
 
+    mPanOffset = {0.0f, 0.0f, 0.0f};
+
     NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
     mCurrentPage = 1;
     mEntryNumText->setText(std::to_string(mCurrentPage) + "/" + mEntryCount);
     convertPage(mCurrentPage);
 }
 
-void PDFViewer::showLastPage()
+void PDFViewer::navigateRightTrigger()
 {
+    if (mZoom != 1.0f) {
+        mZoom = 1.0f;
+        mPanOffset = {0.0f, 0.0f, 0.0f};
+        mHelp->setPrompts(getHelpPrompts());
+        convertPage(mCurrentPage);
+        return;
+    }
+
     if (mCurrentPage == mPageCount)
         return;
 
+    mPanOffset = {0.0f, 0.0f, 0.0f};
+
     NavigationSounds::getInstance().playThemeNavigationSound(SCROLLSOUND);
     mCurrentPage = mPageCount;
     mEntryNumText->setText(std::to_string(mCurrentPage) + "/" + mEntryCount);

es-app/src/PDFViewer.h

@@ -37,10 +37,19 @@ public:
     };
 
 private:
-    void showNextPage() override;
-    void showPreviousPage() override;
-    void showFirstPage() override;
-    void showLastPage() override;
+    void showNextPage();
+    void showPreviousPage();
+
+    void navigateUp() override;
+    void navigateDown() override;
+    void navigateLeft() override;
+    void navigateRight() override;
+
+    void navigateLeftShoulder() override;
+    void navigateRightShoulder() override;
+
+    void navigateLeftTrigger() override;
+    void navigateRightTrigger() override;
 
     struct PageEntry {
         float width;
@@ -56,11 +65,13 @@ private:
     float mScaleFactor;
     int mCurrentPage;
     int mPageCount;
+    float mZoom;
+    float mPanAmount;
+    glm::vec3 mPanOffset;
 
     std::string mESConvertPath;
     std::string mManualPath;
 
-    std::shared_ptr<TextureResource> mTexture;
     std::unique_ptr<ImageComponent> mPageImage;
     std::map<int, PageEntry> mPages;
 

es-core/src/Window.cpp

@@ -249,23 +249,29 @@ void Window::input(InputConfig* config, Input input)
 
     if (mPDFViewer && mRenderPDFViewer) {
         if (config->isMappedLike("up", input) && input.value != 0) {
-            return;
+            mPDFViewer->navigateUp();
         }
         else if (config->isMappedLike("down", input) && input.value != 0) {
-            mPDFViewer->launchMediaViewer();
+            mPDFViewer->navigateDown();
             return;
         }
         else if (config->isMappedLike("left", input) && input.value != 0) {
-            mPDFViewer->showPreviousPage();
+            mPDFViewer->navigateLeft();
         }
         else if (config->isMappedLike("right", input) && input.value != 0) {
-            mPDFViewer->showNextPage();
+            mPDFViewer->navigateRight();
+        }
+        else if (config->isMappedLike("leftshoulder", input) && input.value != 0) {
+            mPDFViewer->navigateLeftShoulder();
+        }
+        else if (config->isMappedLike("rightshoulder", input) && input.value != 0) {
+            mPDFViewer->navigateRightShoulder();
         }
         else if (config->isMappedLike("lefttrigger", input) && input.value != 0) {
-            mPDFViewer->showFirstPage();
+            mPDFViewer->navigateLeftTrigger();
         }
         else if (config->isMappedLike("righttrigger", input) && input.value != 0) {
-            mPDFViewer->showLastPage();
+            mPDFViewer->navigateRightTrigger();
         }
         else if (input.value != 0) {
             // Any other input stops the PDF viewer.

es-core/src/Window.h

@@ -75,10 +75,15 @@ public:
         virtual void stopPDFViewer() = 0;
         virtual void launchMediaViewer() = 0;
 
-        virtual void showNextPage() = 0;
-        virtual void showPreviousPage() = 0;
-        virtual void showFirstPage() = 0;
-        virtual void showLastPage() = 0;
+        virtual void navigateUp() = 0;
+        virtual void navigateDown() = 0;
+        virtual void navigateLeft() = 0;
+        virtual void navigateRight() = 0;
+
+        virtual void navigateLeftShoulder() = 0;
+        virtual void navigateRightShoulder() = 0;
+        virtual void navigateLeftTrigger() = 0;
+        virtual void navigateRightTrigger() = 0;
 
         virtual void render(const glm::mat4& parentTrans) = 0;
         virtual std::vector<HelpPrompt> getHelpPrompts() = 0;